摘要
调湿材料是一种重要的健康环保材料。本工作以硅藻土(DE)和重质碳酸钙(GCC)为原料,用焙烧法制备了硅藻土/重质碳酸钙复合调湿材料(DE/GCC)。采用X射线衍射仪、傅里叶变换红外光谱仪、场发射扫描电子显微镜和低温氮吸附法对样品的物相、表面官能团、微观形貌、表面元素组成和孔结构特性进行了表征,在恒温高湿度环境(RH=70%、80%、90%;30℃)下测试了样品的吸湿性能,并进行吸湿动力学和吸湿机理分析。结果表明,焙烧法制备的DE/GCC中生成了硅酸钙和氢氧钙石,DE/GCC的介孔含量增多,易于形成毛细管凝聚。在相对湿度为70%、80%和90%恒温高湿度环境下,DE/GCC的36 h吸湿量分别达到7.213%、11.159%和14.701%,分别提高到DE的2.1、2.9和3.0倍。吸湿过程动力学符合准二级动力学模型。
Humidity control material is a kind of healthy environmental friendly material. The diatomite/ground calcium carbonate composite humidity control material （DE/GCC） was prepared by calcinations using diatomite （DE） and ground calcium carbonate （GCC） as raw materials. The obtained samples were characterized by X-ray diffraction, field emission scanning electron microscope, Fourier transform infrared spectroscope and low-temperature nitrogen adsorption method to determine the mineral compositions, functional groups, microstruc- ture, surface element compositions and pore structure, respectively. The moisture absorption performance of sam- ples were tested under high relative humidity conditions （RH=70%, 80%, 90%） and the constant temperature of 30℃. The moisture absorption dynamics and humidity control mechanism were analyzed. It is indicated that the calcium silicate and calcium hydroxide are formed in the DE/GCC during the calcinations process. Compared with the raw materials, the content of mesopore increases in the DE/GCC sample, which is in favor of the capillary con- densation. After 36 h test in the environment with relative humidity of 70%, 80% and 90%, the moisture contents of DE/GCC reach 7.213%, 11.159% and 14.701%, which are about 2.1, 2.9 and 3.0 fold as those of DE, respectively. The moisture absorption kinetics follows the pseudo-second-order model.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第1期81-87,共7页
Journal of Inorganic Materials
关键词
硅藻土
重质碳酸钙
调湿材料
硅酸钙
氢氧钙石
diatomite
ground calcium carbonate
humidity control material
calcium silicate
calcium hydroxide
